High-resolution Holocene climate derived from lacustrine sediment: stable isotope evidence from organic and inorganic proxy material

联合国秘书长潘基文宣布气候变化是“我们这个时代的决定性挑战”。尽管今天的金融危机可能很严重，但我们将从中恢复过来，我们不能说全球变暖的潜在灾难。”该跨学科研究旨在表征加拿大西部地表水的现代气象/同位素参数（d18OH2O和dDH2O），并通过湖泊沉积物和软体动物同位素代理数据（d18OCaCO3/d13CCaCO3/d13Corg/d15Norg/ dDcell/d18Ocell）表征全新世气候。由稳定同位素代用资料记录的气候突变期间的温度和降水季节性变化，将通过微磨贝类碳酸盐d18O和d13C值得到。目前，没有什么问题比了解现代和过去的地球气候系统更具有科学意义和紧迫性了。对于人类社会的各个方面，以及全球和区域生态系统来说，增加我们对过去和当代气候制度的了解，以便我们更好地预测和准备未来的气候变化，这一点至关重要。***特别危险的是高纬度地区，那里海冰减少直接影响生物群、热盐循环、热输送和辐射平衡，以及人体系统。永久冻土融化将产生甲烷和二氧化碳，这将进一步使大气变暖。供应北部社区和石油/采矿基础设施的冰路运营频率将降低，从而增加了成本，以及在脆弱的原始环境中发生事故和泄漏的风险。随着北方社区的生活方式进一步受到威胁，他们面临着前所未有的严峻挑战。迁徙将被改变，整个生态系统可能向北移动和/或消失。对气候变化特别敏感的是那些以农业和/或渔业为基础的经济、大量供暖能源需求和/或边际供水的地区。由于加拿大并非孤立于北半球其他陆地和海洋，如果我们要了解加拿大过去、现在和未来的变化，就必须对所有陆地和海洋进行综合评估。我们最近的研究表明，中美洲的水汽输送与向北大西洋的水汽和热量输送直接相关，加拿大北极地区对气候变化的敏感性比以前认为的要高。探索基金的研究将在不同的时间尺度（年代际到年次）重建温度、湿度循环和大气环流，以评估地点之间的远距联系。我们将对这些代理数据进行时间序列分析，以评估过去气候变化的周期性作为位置的函数，从而更好地预测未来区域对人为强迫的响应。

UN Secretary General Ban Ki-moon declared climate change as "the defining challenge of our era.Grave as it may be, today's financial crisis is a passing storm from which we will recover, we cannot say that about the potential catastrophe of global warming." This interdisciplinary DG seeks to characterize modern meteorological/isotopic parameters (d18OH2O and dDH2O) of surface waters from western Canada and characterize Holocene climate from lake sediment and molluscan isotope proxy data (d18OCaCO3/d13CCaCO3/d13Corg/d15Norg/ dDcell/d18Ocell). Changes in seasonality of temperature and precipitation recorded by stable isotope proxy data during abrupt climate change intervals that punctuate long-term trends will be derived by micromilling mollusc shells for carbonate d18O and d13C values. There is currently no issue of greater scientific significance and urgency than gaining an understanding of the Earth's climate system in the modern and through time. It is critical to all aspects of human society, as well as for global and regional ecosystems, that we increase our understanding of both past and contemporary climatic regimes in order that we may better predict, and prepare for future changes in climate. ***At particular risk are the high latitudes where decreasing sea ice directly affects biota, thermohaline circulation, heat transport, and the radiation balance, as well as human systems. Melting permafrost will generate methane and CO2 that will further warm the atmosphere. Ice roads that supply northern communities and oil/mining infrastructure will operate less frequently, thereby increasing costs as well as risk of accidents and spills in delicate pristine environments. Northern communities face new and ever more daunting challenges as their way of life is further threatened. Migrations will be altered and whole ecosystems may move north and/or disappear. Particularly sensitive to climate change are regions that have agriculture and/or fishing-based economies, large heating energy requirements, and/or marginal water supplies.***Because Canada is not isolated from other Northern Hemispheric landmasses and oceans, all must be evaluated together if we are to understand past, present, and future changes in Canada. Our recent research has revealed that moisture transport over Central America is directly related to moisture and heat transport to the North Atlantic, and that the Canadian Arctic is more sensitive to climate change than previously thought. The proposed Discovery Grant research will recreate temperature, moisture cycling, and atmospheric circulation at a variety of time-scales (decadal to subannual) to evaluate teleconnections between locations. We will apply time-series analysis to these proxy data to evaluate climate-change periodicity in the past as a function of location to better predict regional responses to anthropogenic forcing in the future.